Door-check



(No Model.)

G. R. ELLIOTT.

DOOR CHECK.

No. 329,298. Patented Oct. 2'7, 1885.

INVENTO'R UNITED STATES PATENT OFFICE.

GILBERT R. ELLIOTT, OF BOSTON, MASSACHUSETTS.

DOOR-CHECK.

SPECIFICATION forming part of Letters Patent No.329,298, dated October 27, 1885.

Application filed September 3, 1885. Serial No. 176,118.

To all whom it may concern:

Be it known that I, GILBERT R. ELLIOTT, a subject of the Queen of Great Britain, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Door- Checks; and I do declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

Figure 1 is a longitudinal section taken through the center. Fig. 2 is a side view of the piston-rod frictional joint; and Fig. 3 is a view looking upward toward the lintel' of the door, and showing the check as applied, the door being in an open position. Fig. 4 is a view similar to Fig. 3, the door being in a closed position. L

My invention relates to a device for the noiseless closing of doors, and is of that class of checks wherein a cylinder is employed, with a piston movable in the cylinder, to compress air therein as the door is closed, the sudden slamming of the door being prevented by the gradual escape of the air through an adjustable aperture. Pneumatic door-checks of this class have usually been very difficult to adjust upon the door and casing, and have required a skilled person to attach them to the door so as to operate properly.

The object of my invention is the construction of a check that any ordinary person unskilled in the art can adjust to the door and easing so that it will operate effectively.

My invention consists, principally, in a cy1 inder open at one end, combined with a piston and rod, the one stationary and the other applied to the door, so that when opening the door the piston is drawn entirely from the cylinder, and stays in position by reason of a friction-joint attached to the piston-rod, so as to enter the cylinder when the door approaches its closed position, as will be more fully hereinafter described.

A represents the cylinder, open at one end, B, and provided with a bell-shaped mouth, so as to more readily receive the piston. At the end 0 a slotted adj usting-screw is inserted (No model.)

to regulate the exit of the air. The end 0 is also provided with the inlets d d, which are covered with the leather flap a, so as to form a valve to admit of the air entering the cylinder upon the piston being withdrawn from the cylinder, but which close by the action of the valve, and stop the escape of air when the piston moves in the contrary direction. At the bell-shaped or open end B are lugs Z) b, provided for securing the cylinder to the door or casing. The cylinder A is provlded with a piston, D, and suitable cupped leather packing, E. The said piston, when the door is opened, is entirely withdrawn from the cylinder A.

F is the friction-bracket to which the outer end of the piston-rod is hinged. Resting on the piston-rod,between the jaws of the bracket F, is the spring-disk g, the tension of which is controlled by the regulatingscrew h. The

spring-disk g is intended to exert a pressure v and thereby cause friction upon the outer end of the piston-rod, so that the piston will remain in the same position after having been withdrawn from the cylinder.

2' is a washer inserted between the springdisk 9 and the end of the piston-rod in order to get a more regular degree of friction.

In illustrating the operation of my invention I show the piston-rod attached to the door and the cylinder to the casing.

j represents the door, is the hinge, and Z the casing.

The cylinder and bracket are arranged, as seen in Fig. 2, so that the axis of cylinder and piston-rod are at right angles to the door when closed. Thus attached, the door is opened until the piston is withdrawn from the cylinder. During the opening of the door, and consequently withdrawing of the piston, the piston-rod is turning in the frictionj oint in the bracket F. Upon its complete withdrawal from the cylinder the piston and rod will remain stationary, because of the friction-joint in the bracket F, until the door is closed again, when the piston will be in the exact position to enter the cylinder, the bell-mouth of the cylinder making the entrance easy. If the door be closed violently or by means of a spring, all slamming is prevented by the compression of the air in the cylinder and the prevention of the door from closing until the air in the cylinder has had time to escape air aperture at the other, a piston adapted to through the aperture m in the regulatingreciprocate in the cylinder. and a spring fricscrew 19. tion-hinge upon which the piston-rod is mount- I do not claim as new the bell-mouthed cy .ed, as set forth. 15 5 inder open at one end and closed at the other, In testimony whereof I affix my signature with a piston attached to the door, which enin presence of two witnesses. tirely leaves the cylinder, and has the pistonrod hinged or pivoted at its rear end; but GILBERrl ELLIOTT What I do claim is as follows: Witnesses: 10 The combination,substantially as described, JNo. DELAHUNTY,

of a cylinder open at one end and having an I. W. PARMENTER. 

